In a large mixing bowl, whisk together the flour, cocoa powder, sugar, baking powder, and a pinch of salt.
In a separate bowl, whisk the eggs, then add the milk, melted butter, vanilla extract, and Nutella.
Pour the wet ingredients into the dry ingredients, and whisk until smooth, ensuring there are no lumps.
Preheat your waffle iron to medium heat and lightly grease it with butter or oil.
Pour a portion of the batter onto the center of the waffle iron (about one ladleful), then close the lid and cook until golden brown, about 3-4 minutes.
Once ready, carefully remove the waffle with a spatula and place it on a wire rack to cool slightly, so it remains crispy on the outside.
Serve fresh with an extra layer of Nutella, fresh fruit, or a dusting of powdered sugar.
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